McQuay TGZ 050 Operation and Maintenance Manual

Operation and Maintenance Manual

OMM TGZ-1

Group: Chiller

Part Number: 331975601

Effective: February 2011

Supercedes: June 2009

TGZ Scroll Compressor Templifiers





TGZ 040A to TGZ 190A, Packaged Water Heater

600 to 3100 MBH

R134a

Software: WGZDU0102E

Corrections

2/22/11 Changed/added setpoints pgs 62, 63,+

2 TGZ 040A through TGZ 190A OMM TGZ-1

Table of Contents

Introduction ........................................... 3

General Description .......................................... 3

Nomenclature.................................................... 3

Water Pressure Drop ............................. 3

TGZ Scroll........................................................ 4

TGZ Electrical Data.............................. 7

Field Wiring Diagram ......................... 16

Start-Up and Shutdown ...................... 18

Pre Start-up ..................................................... 18

Start-up ........................................................... 18

Weekend or Temporary Shutdown.................. 19

Start-up after Temporary Shutdown................ 19

Extended Shutdown ........................................ 19

Start-up after Extended Shutdown .................. 19

Sequence of Operation ........................ 20

MicroTech II Controller...................... 23

TGZ Controller Software Version................... 23

General Description ........................................ 23

Inputs and Outputs ............................. 25

Large PCO2/PCO3 Controller ........................ 25

Expansion I/O Controller................................ 27

Setpoints ......................................................... 27

Events & Alarms.................................. 30

Protection (Shutdown) Alarms........................ 30

Alarms and Events .............................. 30

Unit Stop Alarms............................................. 30

Limit Events.................................................... 34

Controller Operation ...........................37

EXV Control ................................................... 52

Using the Controller.............................53

Menu Screens.................................................. 55

Menu Descriptions .......................................... 55

BAS Interface ................................................. 72

Optional Controls.................................74

Part Winding Start........................................... 74

Phase/Voltage Monitor (Optional) .................. 74

Hot Gas Bypass (Optional) ............................. 74

System Maintenance ............................76

General............................................................ 76

Electrical Terminals ........................................ 77

Operating Limits ............................................. 77

Compressor Oil ............................................... 77

Oil Equalization .............................................. 78

Sightglass and Moisture Indicator................... 78

Crankcase Heaters........................................... 78

System Service......................................79

Filter-Driers..................................................... 79

Liquid Line Solenoid Valve ............................ 79

Troubleshooting Chart ........................80

the right to make changes in design and construction at anytime without notice. ™® The following are trademarks or registered

trademarks of their respective companies: BACnet from ASHRAE;

L

ON

M

ARK

, LonTalk, L

ON

W

ORKS

, and the L

ON

M

ARK

logo are

managed, granted and used by L

ON

M

ARK

International under a license granted by Echelon Corporation; Compliant Scroll from Copeland

Corporation; Modbus from Schneider Electric; MicroTech II and Open Choices from McQuay International

Manufactured in an ISO Certified facility

OMM TGZ-1 TGZ 040A through TGZ 190A 3

Introduction

General Description

McQuay Type TGZ water heaters are scroll compressor refrigeration units that recover heat from warm

fluid streams in the evaporator and deliver hot water, at a useful temperature, from the condenser to a

heating load. They are designed for indoor installations only and are completely assembled, wired,

charged and tested. Each unit consists of four or six (depending on unit size) scroll compressors,

brazed-plate evaporators on models 040 to 120 and shell-and-tube evaporators on models 150 to 190,

shell-and-tube condenser/heater, and complete refrigerant piping.

There are two refrigerant circuits, each with manual liquid line shutoff valves, charging valves, filter-

driers, liquid line solenoid valves, sightglass/moisture indicators, and expansion valves (thermal on

TGZ 040-120, electronic on TGZ 150-190.

The electrical control center includes a MicroTech II control system and other components necessary

for dependable automatic operation.

NOTE: Additional information not included in this manual, such as unit dimensions and weights,

physical data, and performance data can be found in Catalog Templifier-1.

Nomenclature

T G Z 100 A

Water Pressure Drop

The vessel flow rates must fall between the minimum and maximum values shown on the appropriate

evaporator and condenser curves on pages 4 through 6. Flow rates below the minimum values shown will

result in laminar flow that will reduce efficiency, cause erratic operation of the expansion valve and could

cause low temperature cutoffs. On the other hand, flow rates exceeding the maximum values shown can cause

erosion on the evaporator water connections and tubes.

Measure the water pressure drop through the vessels at field installed pressure taps. It is important not to

include valves or strainers in these readings.

The condenser flow rate will determine whether 2-pass or 4-pass condensers are used, according to the

following table:

CONDENSER DELTA-T PASSES FLOW

10- to 20 Degrees F 2-Pass High Flow Rate

20 to 40 Degrees F 4-Pass Low Flow Rate

The entering water should be piped to the bottom connection of the condenser and out the top.

Templifier

Global

Scroll Compressor

Vintage

Nominal Evaporator

Capacity in Tons

4 TGZ 040A through TGZ 190A OMM TGZ-1

TGZ Scroll

Figure 1, Evaporator Pressure Drop

MINIMUM FLOW RATE NOMINAL FLOW RATE MAXIMUM FLOW RATE

INCH-POUND

S.I. INCH-POUND

S.I.

TGZ UNIT

MODEL

EVAPORATOR

MODEL

GPM FT. L/S KPA GPM FT. LPS KPA GPM FT. LPS KPA

040A

AC250-70DQ 34 1.1 2.1 3.2 72 4.4 4.5 13.2 120 11.6 7.6 34.7

050A

AC250-94DQ 45 1.0 2.8 3.1 100 4.7 6.3 14.0 167 12.5 10.5 37.2

060A

AC250-94DQ 55 1.5 3.5 4.5 121 6.7 7.6 20.0 202 17.7 12.7 53.0

080A

AC350-162DQ 83 1.4 5.2 4.3 162 5.1 10.2 15.2 270 13.5 17.0 40.2

100A

AC350-162DQ 98 2.0 6.2 5.8 189 6.8 11.9 20.3 315 17.9 19.9 53.6

110A

AC350-182DQ 113 2.2 7.1 6.4 218 7.5 13.8 22.4 363 19.8 22.9 59.1

120A

AC350-182DQ 128 2.7 8.1 8.2 246 9.5 15.5 28.4 410 25.1 25.9 74.9

150A

EV34191111/9 147 2.4 9.3 7.3 283 8.5 17.9 25.4 472 22.5 29.8 67.1

170A

EV34191212/7 169 3.5 10.7

10.5 326 12.2 20.6 36.5 543 32.2 34.3 96.1

190A EV34191212/7 192 4.5 12.1

13.4 369 15.5 23.3 46.3 615 40.9 38.8 122.3

Note: Nominal Flow Rate is gpm for 10ºF Delta-T at unit operating conditions of evaporator at 75/65ºF water temp and condenser at

110/30º F water temp.

TGZ Evaporator Water Pressure Drop

TGZ040

TGZ050

TGZ060

TGZ080

TGZ100

TGZ110

TGZ120

TGZ150

TGZ170

TGZ190

1

10

100

10 100 1000

Flow Rate (gpm)

Dp (ft)

TGZ040

TGZ050

TGZ060

TGZ080

TGZ100

TGZ110

TGZ120

TGZ150

TGZ170

TGZ190

OMM TGZ-1 TGZ 040A through TGZ 190A 5

Figure 2, Standard Four-pass Condenser Pressure Drop

TGZ 4-Pass Condenser Water Pressure Drop

TGZ170

TGZ040

TGZ050

TGZ060

TGZ080

TGZ100

TGZ110

TGZ120

TGZ150

TGZ190

1

10

100

10 100 1000

Flow Rate (gpm)

Dp (ft)

TGZ040

TGZ050

TGZ060

TGZ080

TGZ100

TGZ110

TGZ120

TGZ150

TGZ170

TGZ190

MINIMUM FLOW RATE NOMINAL FLOW RATE MAXIMUM FLOW RATE

INCH-POUND

S.I. INCH-POUND

S.I.

TGZ UNIT

MODEL

COND.

MODEL

GPM FT L/S KPA GPM FT L/S KPA GPM

FT L/S KPA

TGZ040

C1010-62

23 1.93 1.45 5.77 47 7.5 3.0 22.4 63 13.1 4.0 39.1

TGZ050

C1010-62

32 2.44 2.02 7.29 64 9.1 4.0 27.2 86 16.0 5.4 47.7

TGZ060

C1010-76

38 3.40 2.40 10.16 77 13.0 4.9 38.9 103 22.6 6.5 67.5

TGZ080

C1410-112

51 2.84 3.22 8.49 103 10.8 6.5 32.3 138 18.8 8.7 56.3

TGZ100

C1410-128

60 3.00 3.79 8.97 120 11.2 7.6 33.5 160 19.3 10.1 57.8

TGZ110

C1610-164

69 2.44 4.35 7.29 138 9.1 8.7 27.2 184 15.7 11.6 47.0

TGZ120

C1610-164

78 3.08 4.92 9.21 156 11.5 9.8 34.4 208 19.9 13.1 59.4

TGZ150

C1612-164

90 4.85 5.68 14.50 180 18.1 11.4 54.1 240 31.3 15.1 93.4

TGZ170

C1612-184

103 4.89 6.50 14.60 207 18.4 13.1 55.0 276 31.8 17.4 95.0

TGZ190

C1612-184

117 6.24 7.38 18.66 234 23.3 14.8 69.6 312 40.2 19.7 120.3

6 TGZ 040A through TGZ 190A OMM TGZ-1

Figure 3, Optional Two-pass Condenser

MINIMUM FLOW RATE NOMINAL FLOW RATE MAXIMUM FLOW RATE

INCH-POUND S.I.

INCH-

POUND

S.I. INCH-POUND S.I.

TGZ UNIT

MODEL

COND.

MODEL.

GPM FT L/S KPA GPM FT L/S KPA GPM FT LPS KPA

TGZ040

C1010-62 59 1.6 3.7 4.9 94 4.0 5.9 12.0 150 9.8 9.5 29.3

TGZ050

C1010-62 80 2.0 5.0 6.0 128 4.9 8.1 14.6 205 12.0 12.9 35.8

TGZ060

C1010-76 96 2.9 6.1 8.5 154 7.0 9.7 20.9 246 17.0 15.5 51.0

TGZ080

C1410-112 129 2.4 8.1 7.1 206 5.8 13.0 17.3 330 14.2 20.8 42.3

TGZ100

C1410-128 150 2.5 9.5 7.3 240 6.0 15.1 17.9 384 14.7 24.2 43.8

TGZ110

C1610-164 173 2.0 10.9 6.0 276 4.9 17.4 14.6 442 12.0 27.9 35.8

TGZ120

C1610-164 195 2.5 12.3 7.6 312 6.2 19.7 18.5 499 15.1 31.5 45.3

TGZ150

C1612-164 225 3.3 14.2 9.9 360 8.1 22.7 24.2 576 19.8 36.3 59.1

TGZ170

C1612-184 259 3.5 16.3 10.4 414 8.5 26.1 25.4 662 20.8 41.8 62.1

TGZ190

C1612-184 293 4.4 18.5 13.2 468 10.8 29.5 32.3 749 26.4 47.2 78.8

TGZ 2-Pass Condenser Water Pressure Drop

TGZ170

TGZ040

TGZ050

TGZ060

TGZ080

TGZ100

TGZ110

TGZ120

TGZ150

TGZ190

1

10

100

10 100 1000

Flow Rate (gpm)

Dp (ft)

TGZ040

TGZ050

TGZ060

TGZ080

TGZ100

TGZ110

TGZ120

TGZ150

TGZ170

TGZ190

OMM TGZ-1 TGZ 040A through TGZ 190A 7

TGZ Electrical Data

Table 1, Compressor Amp Draw

STANDARD UNIT W/O EXT. OL'S

RATED LOAD

AMPS

OPTIONAL UNIT WITH EXT. OL'S

RATED LOAD AMPS (SEE

NOTE 1)

LOCKED ROTOR AMPS

COMPRESSORS

CIRCUIT 1 CIRCUIT 2 CIRCUIT 1 CIRCUIT 2 CIRCUIT 1 CIRCUIT 2

TGZ

UNIT

SIZE

VOLTS

FREQ.

(HERTZ)

No.1

No.3

No.5

No.2

No.4 No.6

No.1

No.3

No.5

No.2

No.4

No.6

No.1

No.3

No.5

No.2

No.4

No.6

208 35.3

35.3

- 35.3

35.3 - 30.8

30.8

- 30.8

30.8

- 239 239

-

230 35.3

35.3

- 35.3

35.3 - 28.0

28.0

- 28.0

28.0

- 239 239

-

460 17.9

17.9

- 17.9

17.9 - 14.0

14.0

- 14.0

14.0

- 125 125

-

040

575

60

11.5

- 11.5

11.5 - 11.2

11.2

- 11.2

11.2

- 80 80 - 80 80 -

208 48.1

48.1

- 48.1

48.1 - 42.0

42.0

- 42.0

42.0

- 300 300

-

230 48.1

48.1

- 48.1

48.1 - 38.4

38.4

- 38.4

38.4

- 300 300

-

460 21.8

21.8

- 21.8

21.8 - 19.2

19.2

- 19.2

19.2

- 150 150

-

050

575

60

19.9

- 19.9

19.9 - 15.2

15.2

- 15.2

15.2

- 109 109

-

208 54.0

54.0

- 54.0

54.0 - 54.0

54.0

- 54.0

54.0

- 340 340

-

230 52.6

52.6

- 52.6

52.6 - 48.8

48.8

- 48.8

48.8

- 340 340

-

460 25.6

25.6

- 25.6

25.6 - 24.4

24.4

- 24.4

24.4

- 173 173

-

060

575

60

21.2

- 21.2

21.2 - 19.6

19.6

- 19.6

19.6

- 132 132

-

208 73.1

73.1

- 73.1

73.1 - 58.0

58.0

- 58.0

58.0

- 505 505

-

230 73.1

73.1

- 73.1

73.1 - 52.8

52.8

- 52.8

52.8

- 505 505

-

460 30.1

30.1

- 30.1

30.1 - 26.4

26.4

- 26.4

26.4

- 225 225

-

080

575

60

24.4

- 24.4

24.4 - 21.2

21.2

- 21.2

21.2

- 180 180

-

208 73.1

73.1

- 73.1

73.1 - 69.2

69.2

- 69.2

69.2

- 500 500

-

230 73.1

73.1

- 73.1

73.1 - 62.4

62.4

- 62.4

62.4

- 500 500

-

460 35.3

35.3

- 35.3

35.3 - 31.2

31.2

- 31.2

31.2

- 250 250

-

100

575

60

28.2

- 28.2

28.2 - 25.2

25.2

- 25.2

25.2

- 198 198

-

208 73.1

73.1

- 93.6

93.6 - 69.2

69.2

- 88.8

88.8

- 500 500

- 599 599

-

230 73.1

73.1

- 93.6

93.6 - 62.4

62.4

- 80.0

80.0

- 500 500

- 599 599

-

460 35.3

35.3

- 45.5

45.5 - 31.2

31.2

- 40.0

40.0

- 250 250

- 310 310

-

110

575

60

28.2

- 36.5

36.5 - 25.2

25.2

- 32.0

32.0

- 198 198

- 239 239

-

208 93.6

93.6

- 93.6

93.6 - 88.8

88.8

- 88.8

88.8

- 599 599

-

230 93.6

93.6

- 93.6

93.6 - 80.0

80.0

- 80.0

80.0

- 599 599

-

460 45.5

45.5

- 45.5

45.5 - 40.0

40.0

- 40.0

40.0

- 310 310

-

120

575

60

36.5

- 36.5

36.5 - 32.0

32.0

- 32.0

32.0

- 239 239

-

208 73.1

73.1

73.1 73.1

69.2

500 500

500 500 500

500

230 73.1

73.1

73.1 73.1

62.4

500 500

500 500 500

500

460 35.3

35.3

35.3 35.3

31.2

250 250

250 250 250

250

150

575

60

28.2

28.2 28.2

25.2

198 198

198 198 198

198

208 73.1

73.1

93.6

93.6 93.6

69.2

88.8

500 500

500 599 599

599

230 73.1

73.1

93.6

93.6 93.6

62.4

80.0

500 500

500 599 599

599

460 35.3

35.3

45.5

45.5 45.5

31.2

40.0

250 250

250 310 310

310

170

575

60

28.2

36.5

36.5 36.5

25.2

32.0

198 198

198 239 239

239

208 93.6

93.6

93.6 93.6

88.8

599 599

599 599 599

599

230 93.6

93.6

93.6 93.6

80.0

599 599

599 599 599

599

460 45.5

45.5

45.5 45.5

40.0

310 310

310 310 310

310

190

575

60

36.5

36.5 36.5

32.0

239 239

239 239 239

239

NOTES:

1. External overloads only available on Templifier units with 140°F maximum condenser leaving water temperature.

2. Unit wire sizing amps are equal to 125% of the largest compressor-motor RLA plus 100% of RLA of all other loads in the circuit including control

transformer.

3. Single point power supply requires a single fused disconnect to supply electrical power to the unit.

4. Compressor RLA values are for wire sizing purposes only and do not reflect normal operating current draw.

8 TGZ 040A through TGZ 190A OMM TGZ-1

Table 2, Wire Sizing Amps, Standard Multi-Point Power Supply

MINIMUM CIRCUIT AMPACITY (MCA) POWER SUPPLY

WITHOUT EXTTERNAL

OVERLOADS

WITH EXTERNAL

OVERLOADS

WITHOUT EXTERNAL

OVERLOADS

WITH EXTERNAL

OVERLOADS

MULTIPLE POINT POWER SUPPLY

WIRE GAUGE

75

°

°°

°

C

WIRE GAUGE

75

°

°°

°

C

TGZ

UNIT

SIZE

VOLTS

FREQ.

(HERTZ)

CIRCUIT

NO.1

CIRCUIT

NO.2

CIRCUIT

NO.1

CIRCUIT

NO.2

FIELD

WIRE

QTY.

CIRCUIT

NO.1

CIRCUIT

NO.2

FIELD

WIRE

QTY.

CIRCUIT

NO.1

CIRCUIT

NO.2

208 79 79 69 69 3 #4 #4 3 #4 #4

230 79 79 63 63 3 #4 #4 3 #6 #6

460 40 40 32 32 3 #8 #8 3 #10 #10

040

575

60

26 26 25 25 3 #10 #10 3 #10 #10

208 108 108 95 95 3 #2 #2 3 #3 #3

230 108 108 86 86 3 #2 #2 3 #3 #3

460 49 49 43 43 3 #8 #8 3 #8 #8

050

575

60

45 45 34 34 3 #8 #8 3 #10 #10

208 122 122 122 122 3 #1 #1 3 #1 #1

230 118 118 110 110 3 #1 #1 3 #2 #2

460 58 58 55 55 3 #6 #6 3 #6 #6

060

575

60

48 48 44 44 3 #8 #8 3 #8 #8

208 165 165 131 131 3 2/0 2/0 3 1/0 1/0

230 165 165 119 119 3 2/0 2/0 3 #1 #1

460 68 68 59 59 3 #4 #4 3 #6 #6

080

575

60

55 55 48 48 3 #6 #6 3 #8 #8

208 165 165 156 156 3 2/0 2/0 3 2/0 2/0

230 165 165 140 140 3 2/0 2/0 3 1/0 1/0

460 79 79 70 70 3 #4 #4 3 #4 #4

100

575

60

64 64 57 57 3 #6 #6 3 #6 #6

208 165 211 156 200 3 2/0 4/0 3 2/0 3/0

230 165 211 140 180 3 2/0 4/0 3 1/0 3/0

460 79 102 70 90 3 #4 #2 3 #4 #3

110

575

60

64 82 57 72 3 #6 #4 3 #6 #4

208 211 211 200 200 3 4/0 4/0 3 3/0 3/0

230 211 211 180 180 3 4/0 4/0 3 3/0 3/0

460 102 102 90 90 3 #2 #2 3 #3 #3

120

575

60

82 82 72 72 3 #4 #4 3 #4 #4

208 238 238 225 225 3 250 250 3 4/0 4/0

230 238 238 203 203 3 250 250 3 4/0 4/0

460 115 115 101 101 3 #2 #2 3 #2 #2

150

575

60

92 92 82 82 3 #3 #3 3 #4 #4

208 238 304 225 289 3 250 350 3 4/0 350

230 238 304 203 260 3 250 350 3 4/0 300

460 115 148 101 130 3 #2 1/0 3 #2 #1

170

575

60

92 119 82 104 3 #3 #1 3 #4 #2

208 304 304 289 289 3 350 350 3 350 350

230 304 304 260 260 3 350 350 3 300 300

460 148 148 130 130 3 1/0 1/0 3 #1 #1

190

575

60

119 119 104 104 3 #1 #1 3 #2 #2

NOTES:

1. Unit wire sizing amps are equal to 125% of the largest compressor-motor RLA plus 100% of the other compressor RLA's.

2. Multiple point power supply requires a separate fused disconnect for each circuit to supply electrical power to the unit.

3. External compressor overload option is only available for units with 140° F maximum leaving condenser water temperature.

4. Wire sizes shown above are for standard ambient temperature and short runs of wire.

OMM TGZ-1 TGZ 040A through TGZ 190A 9

Table 3, Wire Sizing Amps, Optional Single Point Power Supply

MINIMUM CIRCUIT AMPACITY (MCA) POWER SUPPLY

WITHOUT EXTERNAL OL'S

WITH EXTERNAL OL’S

TGZ

UNIT

SIZE

VOLTS

FREQ.

(HERTZ)

SINGLE POINT

POWER SUPPLY )

WITHOUT EXT OL'S

SINGLE POINT

POWER SUPPLY

WITH EXT OL'S

FIELD WIRE

QUANTITY

WIRE GAUGE

75°

°°

°C

FIELD WIRE

QUANTITY

WIRE GAUGE

75°

°°

°C

208

150

131

3

1/0

3

1/0

230 150 119 3 1/0 3 #1

460 76 60 3 #4 3 #6

040

575

60

49 48 3 #8 3 #8

208 204 179 3 4/0 3 3/0

230 204 163 3 4/0 3 2/0

460 93 82 3 #3 3 #4

050

575

60

85 65 3 #4 3 #6

208 230 230 3 4/0 3 4/0

230 224 207 3 4/0 3 4/0

460 109 104 3 #2 3 #2

060

575

60

90 83 3 #3 3 #4

208 311 247 3 400 3 250

230 311 224 3 400 3 4/0

460 128 112 3 #1 3 #2

080

575

60

104 90 3 #2 3 #3

208 311 294 3 400 3 350

230 311 265 3 400 3 300

460 150 133 3 1/0 3 1/0

100

575

60

120 107 3 #1 3 #2

208 357 338 6 (2) 3/0 6 (2) 2/0

230 357 305 6 (2) 3/0 3 350

460 173 152 3 2/0 3 2/0

110

575

60

139 122 3 1/0 3 #1

208 398 377 6 (2) 3/0 6 (2) 3/0

230 398 340 6 (2) 3/0 6 (2) 2/0

460 193 170 3 3/0 3 2/0

120

575

60

155 136 3 2/0 3 1/0

208 457 433 6 (2) 4/0 6 (2) 4/0

230 457 390 6 (2) 4/0 6 (2) 3/0

460 221 195 3 4/0 3 3/0

150

575

60

176 158 3 3/0 3 2/0

208 524 496 6 (2) 300 6 (2) 250

230 524 447 6 (2) 300 6 (2) 4/0

460 254 224 3 250 3 4/0

170

575

60

203 180 3 4/0 3 3/0

208 585 555 6 (2) 350 6 (2) 300

230 585 500 6 (2) 350 6 (2) 250

460 284 250 3 300 3 250

190

575

60

228 200 3 4/0 3 3/0

NOTES:.

1. Unit wire sizing amps are equal to 125% of the largest compressor-motor RLA plus 100% of the other compressor RLA's.

2. Single point power supply requires a single fused disconnect to supply electrical power to the unit.

3. External compressor overload option is only available for units with 140° F maximum leaving condenser water temperature.

4. Wire Sizes shown above are for standard ambient temperature and short runs of wire.

10 TGZ 040A through TGZ 190A OMM TGZ-1

Table 4, Maximum Fuse Sizing

SINGLE POINT POWER SUPPLY MULTIPLE POINT POWER SUPPLY

WITHOUT EXTERNAL OL'S

WITH EXTERNAL OL'S

TGZ

UNIT

SIZE

VOLTAGE

PHASE

FREQ.

(HERTZ)

WITHOUT

EXTERNAL OL'S

TOTAL UNIT

WITH

EXTERNAL OL'S

TOTAL UNIT

CIRC.#1 CIRC.#2 CIRC.#1 CIRC.#2

208 175 150 110 110 100 100

230 175 125 110 110 90 90

460 90 70 50 50 45 45

040

575

60

60 50 35 35 35 35

208 250 200 150 150 125 125

230 250 200 150 150 110 110

460 110 100 70 70 60 60

050

575

60

100 70 60 60 45 45

208 250 250 175 175 175 175

230 250 250 150 150 150 150

460 125 125 80 80 70 70

060

575

60

110 100 60 60 60 60

208 350 300 225 225 175 175

230 350 250 225 225 150 150

460 150 125 90 90 80 80

080

575

60

125 110 70 70 60 60

208 350 350 225 225 200 200

230 350 300 225 225 200 200

460 175 150 110 110 100 100

100

575

60

125 125 90 90 80 80

208 450 400 225 300 200 250

230 450 350 225 300 200 250

460 200 175 110 125 100 125

110

575

60

175 150 90 110 80 100

208 450 450 300 300 250 250

230 450 400 300 300 250 250

460 225 200 125 125 125 125

120

575

60

175 150 110 110 100 100

208 500 500 300 300 250 250

230 500 450 300 300 250 250

460 250 225 150 150 125 125

150

575

60

200 175 110 110 100 100

208 600 500 300 350 250 350

230 600 500 300 350 250 300

460 250 250 150 175 125 150

170

575

60

225 200 110 150 100 125

208 600 600 350 350 350 350

230 600 500 350 350 300 300

460 300 250 175 175 150 150

190

575

60

350 225 150 150 125 125

NOTE:

1. "Maximum Fuse Sizes" are selected at approximately 225% of the largest compressor RLA plus 100% of other compressor RLA values.

OMM TGZ-1 TGZ 040A through TGZ 190A 11

Table 5, Connection Sizes, Single Point Power Supply, Without External Overloads

Power Block Terminal Factory Installed Disconnect Factory Installed HSCCR

Power Block or

Bus Bar Lugs

Disconnect Switch

Molded Case

Disconnect Switch

(Circuit Breaker )

Circ. Brkr Connection (2)

TGZ

Unit

Size

Volts

Freq.

(Hertz)

Size (1)

Connection (2)

Wire Range - CU

Switch

Size (1)

Connection (2)

Wire Range - CU

Size (1) Wire Range - CU

208 380 #4 - 500 kcmil 250 #6 - 350 kcmil 250 #6 - 350 kcmil

230 380 #4 - 500 kcmil 250 #6 - 350 kcmil 250 #6 - 350 kcmil

460 175 #14 - 2/0 100 #10 - 1/0 150 #6 - 350 kcmil

040

575

60

175 #14 - 2/0 100 #10 - 1/0 90 #10 - 1/0

208 380 #4 - 500 kcmil 250 #6 - 350 kcmil 350 (2) 3/0 - 500 kcmil

230 380 #4 - 500 kcmil 250 #6 - 350 kcmil 350 (2) 3/0 - 500 kcmil

460 175 #14 - 2/0 125 #3 - 3/0 175 #6 - 350 kcmil

050

575

60

175 #14 - 2/0 100 #10 - 1/0 150 #6 - 350 kcmil

208 380 #4 - 500 kcmil 250 #6 - 350 kcmil 400 (2) 3/0 - 500 kcmil

230 380 #4 - 500 kcmil 250 #6 - 350 kcmil 400 (2) 3/0 - 500 kcmil

460 175 #14 - 2/0 125 #3 - 3/0 200 #6 - 350 kcmil

060

575

60

175 #14 - 2/0 100 #10 - 1/0 150 #6 - 350 kcmil

208 380 #4 - 500 kcmil 400 (2) 3/0 - 500 kcmil 400 (2) 3/0 - 500 kcmil

230 380 #4 - 500 kcmil 400 (2) 3/0 - 500 kcmil 400 (2) 3/0 - 500 kcmil

460 175 #14 - 2/0 250 #6 - 350 kcmil 225 #6 - 350 kcmil

080

575

60

175 #14 - 2/0 125 #3 - 3/0 175 #6 - 350 kcmil

208 380 #4 - 500 kcmil 400 (2) 3/0 - 500 kcmil 600 (2) 3/0 - 500 kcmil

230 380 #4 - 500 kcmil 400 (2) 3/0 - 500 kcmil 600 (2) 3/0 - 500 kcmil

460 175 #14 - 2/0 250 #6 - 350 kcmil 250 #6 - 350 kcmil

100

575

60

175 #14 - 2/0 250 #6 - 350 kcmil 200 #6 - 350 kcmil

208 380 #4 - 500 kcmil 400 (2) 3/0 - 500 kcmil 600 (2) 3/0 - 500 kcmil

230 380 #4 - 500 kcmil 400 (2) 3/0 - 500 kcmil 600 (2) 3/0 - 500 kcmil

460 380 #4 - 500 kcmil 250 #6 - 350 kcmil 300 (2) 3/0 - 500 kcmil

110

575

60

175 #14 - 2/0 250 #6 - 350 kcmil 250 #6 - 350 kcmil

208 760 (2) #2 - 500 kcmil 600 (2) 3/0 - 500 kcmil 700 (2) 3/0 - 500 kcmil

230 760 (2) #2 - 500 kcmil 600 (2) 3/0 - 500 kcmil 700 (2) 3/0 - 500 kcmil

460 380 #4 - 500 kcmil 250 #6 - 350 kcmil 400 (2) 3/0 - 500 kcmil

120

575

60

175 #14 - 2/0 250 #6 - 350 kcmil 300 (2) 3/0 - 500 kcmil

208 760 (2) #2 - 500 kcmil 600 (2) 3/0 - 500 kcmil 800 (3) 1/0 - 500 kcmil

230 760 (2) #2 - 500 kcmil 600 (2) 3/0 - 500 kcmil 800 (3) 1/0 - 500 kcmil

460 380 #4 - 500 kcmil 250 #6 - 350 kcmil 400 (2) 3/0 - 500 kcmil

150

575

60

380 #4 - 500 kcmil 250 #6 - 350 kcmil 300 (2) 3/0 - 500 kcmil

208 760 (2) #2 - 500 kcmil 600 (2) 3/0 - 500 kcmil 1000 (3) 1/0 - 500 kcmil

230 760 (2) #2 - 500 kcmil 600 (2) 3/0 - 500 kcmil 1000 (3) 1/0 - 500 kcmil

460 380 #4 - 500 kcmil 400 (2) 3/0 - 500 kcmil 450 (2) 3/0 - 500 kcmil

170

575

60

380 #4 - 500 kcmil 250 #6 - 350 kcmil 350 (2) 3/0 - 500 kcmil

208 760 (2) #2 - 500 kcmil 800 (3) 1/0 - 500 kcmil 1000 (3) 1/0 - 500 kcmil

230 760 (2) #2 - 500 kcmil 800 (3) 1/0 - 500 kcmil 1000 (3) 1/0 - 500 kcmil

460 380 #4 - 500 kcmil 400 (2) 3/0 - 500 kcmil 500 (2) 3/0 - 500 kcmil

190

575

60

380 #4 - 500 kcmil 400 (2) 3/0 - 500 kcmil 400 (2) 3/0 - 500 kcmil

NOTES:.

1. "Size" is the maximum amperage rating for the terminals or the main electrical device...

2. "Connection" is the range of wire sizes that the terminals on the electrical device will accept.

12 TGZ 040A through TGZ 190A OMM TGZ-1

Table 6, Connection Sizes, Single Point Power Supply with External Overloads

Power Block Terminal Factory Installed Disconnect Factory Installed HSCCR

Power Block or

Bus Bar Lugs

Disconnect Switch

Molded Case

Disconnect Switch

(Circuit Breaker )

TGZ

Unit

Size

Volts

Freq.

(Hertz)

Size (1)

Connection (2)

Wire Range - CU

Switch

Size (1)

Connection (2)

Wire Range - CU

Circ. Brkr

Size (1)

Connection (2)

Wire Range - CU

208 335 #6 - 400 kcmil 250 #6 - 350 kcmil 250 #6 - 350 kcmil

230 335 #6 - 400 kcmil 250 #6 - 350 kcmil 250 #6 - 350 kcmil

460 175 #14 - 2/0 100 #3 - 3/0 150 #4 - 350 kcmil

040

575

60

175 #14 - 2/0 100 #3 - 3/0 150 #4 - 350 kcmil

208 335 #6 - 400 kcmil 250 #6 - 350 kcmil 250 #6 - 350 kcmil

230 335 #6 - 400 kcmil 250 #6 - 350 kcmil 250 #6 - 350 kcmil

460 175 #14 - 2/0 125 #3 - 3/0 125 #3 - 3/0

050

575

60

175 #14 - 2/0 100 #3 - 3/0 100 #3 - 3/0

208 335 #6 - 400 kcmil 250 #6 - 350 kcmil 400 (2) 3/0 - 500 kcmil

230 335 #6 - 400 kcmil 250 #6 - 350 kcmil 400 (2) 3/0 - 500 kcmil

460 175 #14 - 2/0 125 #3 - 3/0 125 #3 - 3/0

060

575

60

175 #14 - 2/0 100 #3 - 3/0 125 #3 - 3/0

208 760 (2) #2 - 500 kcmil 400 (2) 3/0 - 500 kcmil

400 (2) 3/0 - 500 kcmil

230 760 (2) #2 - 500 kcmil 400 (2) 3/0 - 500 kcmil

400 (2) 3/0 - 500 kcmil

460 335 #6 - 400 kcmil 250 #6 - 350 kcmil 250 #6 - 350 kcmil

080

575

60

335 #6 - 400 kcmil 125 #3 - 3/0 125 #3 - 3/0

208 760 (2) #2 - 500 kcmil 400 (2) 3/0 - 500 kcmil

600 (2) 3/0 - 500 kcmil

230 760 (2) #2 - 500 kcmil 400 (2) 3/0 - 500 kcmil

600 (2) 3/0 - 500 kcmil

460 335 #6 - 400 kcmil 250 #6 - 350 kcmil 250 #6 - 350 kcmil

100

575

60

335 #6 - 400 kcmil 250 #6 - 350 kcmil 250 #6 - 350 kcmil

208 760 (2) #2 - 500 kcmil 400 (2) 3/0 - 500 kcmil

600 (2) 3/0 - 500 kcmil

230 760 (2) #2 - 500 kcmil 400 (2) 3/0 - 500 kcmil

600 (2) 3/0 - 500 kcmil

460 335 #6 - 400 kcmil 250 #6 - 350 kcmil 250 #6 - 350 kcmil

110

575

60

335 #6 - 400 kcmil 250 #6 - 350 kcmil 250 #6 - 350 kcmil

208 760 (2) #2 - 500 kcmil 600 (2) 3/0 - 500 kcmil

600 (2) 3/0 - 500 kcmil

230 760 (2) #2 - 500 kcmil 600 (2) 3/0 - 500 kcmil

600 (2) 3/0 - 500 kcmil

460 335 #6 - 400 kcmil 250 #6 - 350 kcmil 400 (2) 3/0 - 500 kcmil

120

575

60

335 #6 - 400 kcmil 250 #6 - 350 kcmil 250 #6 - 350 kcmil

208 760 (2) #2 - 500 kcmil 600 (2) 3/0 - 500 kcmil

800 (3) 1/0 - 500 kcmil

230 760 (2) #2 - 500 kcmil 600 (2) 3/0 - 500 kcmil

800 (3) 1/0 - 500 kcmil

460 335 #6 - 400 kcmil 250 #6 - 350 kcmil 400 (2) 3/0 - 500 kcmil

150

575

60

335 #6 - 400 kcmil 250 #6 - 350 kcmil 250 #6 - 350 kcmil

208 760 (2) #2 - 500 kcmil 800 (3) 1/0 - 500 kcmil

800 (3) 1/0 - 500 kcmil

230 760 (2) #2 - 500 kcmil 800 (3) 1/0 - 500 kcmil

800 (3) 1/0 - 500 kcmil

460 335 #6 - 400 kcmil 400 (2) 3/0 - 500 kcmil

400 (2) 3/0 - 500 kcmil

170

575

60

335 #6 - 400 kcmil 250 #6 - 350 kcmil 400 (2) 3/0 - 500 kcmil

208 760 (2) #2 - 500 kcmil 800 (3) 1/0 - 500 kcmil

800 (3) 1/0 - 500 kcmil

230 760 (2) #2 - 500 kcmil 800 (3) 1/0 - 500 kcmil

800 (3) 1/0 - 500 kcmil

460 335 #6 - 400 kcmil 400 (2) 3/0 - 500 kcmil

400 (2) 3/0 - 500 kcmil

190

575

60

335 #6 - 400 kcmil 400 (2) 3/0 - 500 kcmil

400 (2) 3/0 - 500 kcmil

NOTES:

1. "Size" is the maximum amperage rating for the terminals or the main electrical device.

2. "Connection" is the range of wire sizes that the terminals on the electrical device will accept.

OMM TGZ-1 TGZ 040A through TGZ 190A 13

Table 7, Connection Sizes, Multi-Point Power Connection, without External Overloads

Power Terminal Block Factory Installed Disconnect

Circuit #1 Circuit #2 Circ.#1 Circ.#2

Molded Case

TGZ

Unit

Size

Volts

Power Block or

Bus Bar Lugs

Size (1)

Connection

Wire Range

(2)

Power Block/

Bus Bar Lugs

Size (1)

Connection (2)

Wire Range

Switch

Size (1)

Connection (2)

Wire Range

Switch

Size (1)

Connection (2)

Wire Range U

208 175 #14 - 2/0 175 #14 - 2/0 100 #10 - 1/0 100 #10 - 1/0

230 175 #14 - 2/0 175 #14 - 2/0 100 #10 - 1/0 100 #10 - 1/0

460 175 #14 - 2/0 175 #14 - 2/0 100 #10 - 1/0 100 #10 - 1/0

040

575 175 #14 - 2/0 175 #14 - 2/0 100 #10 - 1/0 100 #10 - 1/0

208 175 #14 - 2/0 175 #14 - 2/0 125 #3 - 3/0 125 #3 - 3/0

230 175 #14 - 2/0 175 #14 - 2/0 125 #3 - 3/0 125 #3 - 3/0

460 175 #14 - 2/0 175 #14 - 2/0 100 #10 - 1/0 100 #10 - 1/0

050

575 175 #14 - 2/0 175 #14 - 2/0 100 #10 - 1/0 100 #10 - 1/0

208 175 #14 - 2/0 175 #14 - 2/0 125 #3 - 3/0 125 #3 - 3/0

230 175 #14 - 2/0 175 #14 - 2/0 125 #3 - 3/0 125 #3 - 3/0

460 175 #14 - 2/0 175 #14 - 2/0 100 #10 - 1/0 100 #10 - 1/0

060

575 175 #14 - 2/0 175 #14 - 2/0 100 #10 - 1/0 100 #10 - 1/0

208 175 #14 - 2/0 175 #14 - 2/0 250 #6 - 350 kcmil 250 #6 - 350 kcmil

230 175 #14 - 2/0 175 #14 - 2/0 250 #6 - 350 kcmil 250 #6 - 350 kcmil

460 175 #14 - 2/0 175 #14 - 2/0 100 #10 - 1/0 100 #10 - 1/0

080

575 175 #14 - 2/0 175 #14 - 2/0 100 #10 - 1/0 100 #10 - 1/0

208 175 #14 - 2/0 175 #14 - 2/0 250 #6 - 350 kcmil 250 #6 - 350 kcmil

230 175 #14 - 2/0 175 #14 - 2/0 250 #6 - 350 kcmil 250 #6 - 350 kcmil

460 175 #14 - 2/0 175 #14 - 2/0 100 #10 - 1/0 100 #10 - 1/0

100

575 175 #14 - 2/0 175 #14 - 2/0 100 #10 - 1/0 100 #10 - 1/0

208 380 #4 - 500 kcmil

380 #4 - 500 kcmil

250 #6 - 350 kcmil 250 #6 - 350 kcmil

230 380 #4 - 500 kcmil

380 #4 - 500 kcmil

250 #6 - 350 kcmil 250 #6 - 350 kcmil

460 175 #14 - 2/0 175 #14 - 2/0 100 #10 - 1/0 125 #3 - 3/0

110

575 175 #14 - 2/0 175 #14 - 2/0 100 #10 - 1/0 100 #10 - 1/0

208 380 #4 - 500 kcmil

380 #4 - 500 kcmil

250 #6 - 350 kcmil 250 #6 - 350 kcmil

230 380 #4 - 500 kcmil

380 #4 - 500 kcmil

250 #6 - 350 kcmil 250 #6 - 350 kcmil

460 175 #14 - 2/0 175 #14 - 2/0 125 #3 - 3/0 125 #3 - 3/0

120

575 175 #14 - 2/0 175 #14 - 2/0 100 #10 - 1/0 100 #10 - 1/0

208 380 #4 - 500 kcmil

380 #4 - 500 kcmil

400 (2) 3/0 - 500 kcmil

230 380 #4 - 500 kcmil

380 #4 - 500 kcmil

400 (2) 3/0 - 500 kcmil

460 175 #14 - 2/0 175 #14 - 2/0 125 #3 - 3/0 125 #3 - 3/0

150

575 175 #14 - 2/0 175 #14 - 2/0 125 #3 - 3/0 125 #3 - 3/0

208 380 #4 - 500 kcmil

380 #4 - 500 kcmil

400 (2) 3/0 - 500 kcmil

230 380 #4 - 500 kcmil

380 #4 - 500 kcmil

400 (2) 3/0 - 500 kcmil

460 175 #14 - 2/0 175 #14 - 2/0 250 #6 - 350 kcmil 250 #6 - 350 kcmil

170

575 175 #14 - 2/0 175 #14 - 2/0 125 #3 - 3/0 250 #6 - 350 kcmil

208 380 #4 - 500 kcmil

380 #4 - 500 kcmil

400 (2) 3/0 - 500 kcmil

230 380 #4 - 500 kcmil

380 #4 - 500 kcmil

400 (2) 3/0 - 500 kcmil

460 175 #14 - 2/0 175 #14 - 2/0 250 #6 - 350 kcmil 250 #6 - 350 kcmil

190

575 175 #14 - 2/0 175 #14 - 2/0 250 #6 - 350 kcmil 250 #6 - 350 kcmil

14 TGZ 040A through TGZ 190A OMM TGZ-1

Table 8, Connection Sizes, Multi-Point Power Connection, with External Overloads

Power Terminal Block Factory Installed Disconnect

Circuit #1 Circuit #2 Circ.#1 Circ.#2

Molded Case

TGZ

Unit

Size

Volts

Power Block or

Bus Bar Lugs

Size

Connection)

Wire Range

Power Block or

Bus Bar Lugs

Size

Connection

Wire Range

Switch

Size

Connection

Wire Range

Switch

Size

Connection

Wire Range -

208 175 #14 - 2/0 175 #14 - 2/0 100 #10 - 1/0 100 #10 - 1/0

230 175 #14 - 2/0 175 #14 - 2/0 100 #10 - 1/0 100 #10 - 1/0

460 175 #14 - 2/0 175 #14 - 2/0 100 #10 - 1/0 100 #10 - 1/0

040

575 175 #14 - 2/0 175 #14 - 2/0 100 #10 - 1/0 100 #10 - 1/0

208 175 #14 - 2/0 175 #14 - 2/0 125 #3 - 3/0 125 #3 - 3/0

230 175 #14 - 2/0 175 #14 - 2/0 125 #3 - 3/0 125 #3 - 3/0

460 175 #14 - 2/0 175 #14 - 2/0 100 #10 - 1/0 100 #10 - 1/0

050

575 175 #14 - 2/0 175 #14 - 2/0 100 #10 - 1/0 100 #10 - 1/0

208 175 #14 - 2/0 175 #14 - 2/0 125 #3 - 3/0 125 #3 - 3/0

230 175 #14 - 2/0 175 #14 - 2/0 125 #3 - 3/0 125 #3 - 3/0

460 175 #14 - 2/0 175 #14 - 2/0 100 #10 - 1/0 100 #10 - 1/0

060

575 175 #14 - 2/0 175 #14 - 2/0 100 #10 - 1/0 100 #10 - 1/0

208 175 #14 - 2/0 175 #14 - 2/0 250 #6 - 350 kcmil 250 #6 - 350 kcmil

230 175 #14 - 2/0 175 #14 - 2/0 250 #6 - 350 kcmil 250 #6 - 350 kcmil

460 175 #14 - 2/0 175 #14 - 2/0 100 #10 - 1/0 100 #10 - 1/0

080

575 175 #14 - 2/0 175 #14 - 2/0 100 #10 - 1/0 100 #10 - 1/0

208 175 #14 - 2/0 175 #14 - 2/0 250 #6 - 350 kcmil 250 #6 - 350 kcmil

230 175 #14 - 2/0 175 #14 - 2/0 250 #6 - 350 kcmil 250 #6 - 350 kcmil

460 175 #14 - 2/0 175 #14 - 2/0 100 #10 - 1/0 100 #10 - 1/0

100

575 175 #14 - 2/0 175 #14 - 2/0 100 #10 - 1/0 100 #10 - 1/0

208 380 #4 - 500 kcmil

380 #4 - 500 kcmil

250 #6 - 350 kcmil 250 #6 - 350 kcmil

230 380 #4 - 500 kcmil

380 #4 - 500 kcmil

250 #6 - 350 kcmil 250 #6 - 350 kcmil

460 175 #14 - 2/0 175 #14 - 2/0 100 #10 - 1/0 125 #3 - 3/0

110

575 175 #14 - 2/0 175 #14 - 2/0 100 #10 - 1/0 100 #10 - 1/0

208 380 #4 - 500 kcmil

380 #4 - 500 kcmil

250 #6 - 350 kcmil 250 #6 - 350 kcmil

230 380 #4 - 500 kcmil

380 #4 - 500 kcmil

250 #6 - 350 kcmil 250 #6 - 350 kcmil

460 175 #14 - 2/0 175 #14 - 2/0 125 #3 - 3/0 125 #3 - 3/0

120

575 175 #14 - 2/0 175 #14 - 2/0 100 #10 - 1/0 100 #10 - 1/0

208 380 #4 - 500 kcmil

380 #4 - 500 kcmil

400 (2) 3/0 - 500 kcmil

230 380 #4 - 500 kcmil

380 #4 - 500 kcmil

400 (2) 3/0 - 500 kcmil

460 175 #14 - 2/0 175 #14 - 2/0 125 #3 - 3/0 125 #3 - 3/0

150

575 175 #14 - 2/0 175 #14 - 2/0 125 #3 - 3/0 125 #3 - 3/0

208 380 #4 - 500 kcmil

380 #4 - 500 kcmil

400 (2) 3/0 - 500 kcmil

230 380 #4 - 500 kcmil

380 #4 - 500 kcmil

400 (2) 3/0 - 500 kcmil

460 175 #14 - 2/0 175 #14 - 2/0 250 #6 - 350 kcmil 250 #6 - 350 kcmil

170

575 175 #14 - 2/0 175 #14 - 2/0 125 #3 - 3/0 250 #6 - 350 kcmil

208 380 #4 - 500 kcmil

380 #4 - 500 kcmil

400 (2) 3/0 - 500 kcmil

230 380 #4 - 500 kcmil

380 #4 - 500 kcmil

400 (2) 3/0 - 500 kcmil

460 175 #14 - 2/0 175 #14 - 2/0 250 #6 - 350 kcmil 250 #6 - 350 kcmil

190

575 175 #14 - 2/0 175 #14 - 2/0 250 #6 - 350 kcmil 250 #6 - 350 kcmil

OMM TGZ-1 TGZ 040A through TGZ 190A 15

Field Wiring, Power

The TGZ units are supplied standard with compressor contactors and power terminal block, designed for multi-

point power supply to the unit, no compressor circuit breakers. Available options are:

• Single-point connection to power block with compressor circuit breakers

• Single-point connection to disconnect switch with compressor circuit breakers

• High short circuit current rating with single-point disconnect switch

• Multi-point connection to disconnect switch, no compressor circuit breakers

A factory installed control circuit transformer is standard. Optionally, a field-installed control power source

can be wired to the unit.

Wiring and conduit selections must comply with the National Electrical Code and/or local requirements.

An open fuse indicates a short, ground, or overload. Before replacing a fuse or restarting a compressor,

the trouble must be found and corrected. Tables in the Electrical Data section (page 4) give specific

information on recommended wire sizes.

Unit power inlet wiring must enter the control box through the right side. A 7/8-inch pilot knockout is provided.

Refer to the unit dimension drawings for the location of power and control connections.

!

CAUTION

To avoid equipment damage, use only copper conductors in main terminal block.

Control Power

A factory mounted control transformer is provided to supply the correct control circuit voltage.

16 TGZ 040A through TGZ 190A OMM TGZ-1

Field Wiring Diagram

Figure 4, Field Wiring Diagram

FIELD WIRING FOR TGZ

DWG. 330538901 REV.0D (MOD)

KDL 09-04-08

WITH MICROTECH CONTROLLER

TO COMPRESSOR(S)

AND FAN MOTORS

DISCONNECT

(BY OTHERS)

3 PHASE

POWER

120VAC

CONTROL POWER

GND LUG

UNIT MAIN

TERMINAL BLOCK

FUSED CONTROL

CIRCUIT TRANSFORMER

OPTION

120 VAC

TB1

TB1-20

CHW PUMP RELAY (BY OTHERS)

120 VAC 1.0 AMP MAX

DISCONNECT

(BY OTHERS)

N

FIELD

SUPPLIED

OPTION

10A

FUSE

(BY OTHERS)

CONTROL

CIRCUIT

FUSE

2

1

N

120 VAC

14

11

NOTE: ALL FIELD WIRING TO BE

INSTALLED AS NEC CLASS 1

WIRING SYSTEM WITH CONDUCTOR

RATED 600 VOLTS

SUPPLY

GND

ALARM BELL RELAY

FACTORY SUPPLIED ALARM

FIELD WIRED

ALARM

BELL

OPTION

10

15

CONTROLLER

TB2

ICE MODE SWITCH

(BY OTHERS)

51

52

42

60

40

53

43

55

49

50

ALARM BELL

RELAY

ALARM BELL OPTION

BELL

1 2

COM

NO

AUTO

TIME

CLOCK

OFF

ON

MANUAL

AUTO

OFF

ON

MANUAL

REMOTE STOP

SWITCH

(BY OTHERS)

IF REMOTE STOP

CONTROL IS USED,

REMOVE LEAD 897

FROM TERM. 40 TO 53.

897

4-20MA FOR

LEAVING WATER RESET

(BY OTHERS)

+

-

4-20MA FOR

DEMAND LIMIT

(BY OTHERS)

+

GND

-

33

44

CHW FLOW SWITCH

---MANDATORY–-

(BY OTHERS)

NOR. OPEN PUMP AUX. CONTACTS (OPTIONAL)

41

54

CDW FLOW SWITCH

---MANDATORY–-

(BY OTHERS)

NOR. OPEN PUMP AUX. CONTACTS (OPTIONAL)

N

120 VAC

CDW PUMP RELAY (BY OTHERS)

120 VAC 1.0 AMP MAX

TOWER FAN #1 COIL (BY OTHERS)

120 VAC 1.0 AMP MAX

TOWER FAN #2 COIL (BY OTHERS)

120 VAC 1.0 AMP MAX

TB1-12

J15-NO8

TB1-12

J16-NO9

J16-NO10

TB3-90

TB3-91

TB3-92

79

80

N

0-10 VDC

77

78

N

0-10 VDC

COOLING TOWER BYPASS

(BY OTHERS)

COOLING TOWER BYPASS

(BY OTHERS)

TB3

OMM TGZ-1 TGZ 040A through TGZ 190A 17

Figure 5, Control Center Layout

(3) 120V/24V

Transformers

LineV/120V

Control

Transformer

Control

Transformer

Fuses, Primary

Control

Transformer

Fuse, Secondary

Optional Disconnect

Switch

Microtech II

Controller

(2) Circuit

Mechanical

Hi-Pressure Switch

Relays

(4) Compressor

Contactors

Grounding Lug

Location for

Optional External

Overloads

7/8-in. KO for

control wiring

Switches

On Side

KO for Power

Wiring

18 TGZ 040A through TGZ 190A OMM TGZ-1

Start-Up and Shutdown

Pre Start-up

1. With main disconnect open, check all electrical connections in control panel and starter to be sure

they are tight and provide good electrical contact. Although connections are tightened at the factory,

they can have loosened enough in shipment to cause a malfunction.

2. Check and inspect all water piping. Make sure flow direction is correct and piping is made to

correct connection on evaporator and condenser.

3. Open all water flow valves to the condenser and evaporator.

4. Flush the cooling tower (if one is in the system) and system piping to be sure the system is clean.

Start source water pump and manually start hot water pump. Check all piping for leaks. Vent the air

from the evaporator and condenser water circuit as well as from the entire water system. The cooler

circuits should contain clean, non-corrosive water.

5. Check to see that the water temperature thermostat sensor is installed in the correct water line.

6. Making sure control stop switch S1 is open (off) and pumpdown switches PS1 and PS2 are on

“manual pumpdown”, move the main power and control disconnect switches to “on.” This will

energize crankcase heaters. Wait a minimum of 12 hours before starting up unit.

7. Check compressor oil level. The oil level should be at least one-third of the oil sightglass.

8. Check pressure drop across evaporator and condenser, and see that water flow is correct per the

design flow rates and data on pages 4 through 6.

9. Check the actual line voltage to the unit to make sure it is the same as called for on the compressor

nameplate within + 10% and that phase voltage unbalance does not exceed 2%. Verify that adequate

power supply and capacity is available to handle load.

10. Make sure all wiring and fuses are of the proper size. Also make sure all interlock wiring is

completed per McQuay diagrams.

11. Verify that all mechanical and electrical inspections by code authorities have been completed.

12. Make sure all auxiliary load and control equipment is operative and that an adequate cooling load is

available for initial start-up.

Start-up

1. Open the compressor suction and discharge shutoff valves until backseated. Replace valve caps.

2. Open the manual liquid line shutoff valve.

3. Check to see that the unit circuit breakers are in the “off” position.

4. Check to see that the pumpdown switches PS1 and PS2 are in the “manual pumpdown” position and

the control system switch S1 is in the “off” position.

5. Place the main power and control circuit disconnects to the “on” position.

6. Verify crankcase heaters have operated for at least 12 hours prior to start-up. Crankcase should be

warm.

7. Adjust the setpoint on the MicroTech controller to the desired hot water temperature.

8. Start the auxiliary equipment for the installation by turning on the time clock, ambient thermostat

and/or remote on/off switch and chilled water pump.

9. Check resets of all equipment protection controls.

10. Switch the unit circuit breakers to on.

11. Place pumpdown switch(es) PS1 and PS2 to “auto” for restart and normal operation.

12. Start the system by pushing the system switch S1 to on.

13. After running the unit for a short time, check the oil level in each compressor crankcase and check

for flashing in the refrigerant sightglass.

14. After system performance has stabilized, it is necessary that the “Compressorized Equipment

Warranty Form” (Form No. 206036A) be completed to obtain full warranty benefits. Be sure to list

the pressure drop across both vessels. This form is shipped with the unit and after completion

should be returned to the McQuay Service Department through your sales representative.

OMM TGZ-1 TGZ 040A through TGZ 190A 19

Weekend or Temporary Shutdown

Move pumpdown switch(es) PS1 and PS2 to the “manual pumpdown” position.

Note: With the unit in this condition, it is capable of limited pumpdown. To defeat this mode of

operation, simply move control system switch S1 to the “off” position.

!

CAUTION

The compressors must complete pump down before the water flow to the unit is interrupted to

avoid freeze-up damage in the evaporator.

Start-up after Temporary Shutdown

1. Start the source water and hot water flow through the unit.

2. With the control system switch S1 in the “on” position, move the pumpdown switch(es) PS1

and PS2 to the “auto pumpdown” position.

3. Observe the unit operation for a short time, noting unusual sounds or cycling of compressors.

Extended Shutdown

1. Close the manual liquid line shutoff valves.

2. After the compressors have pumped down, stop or bypass the source water and hot water flow.

3. Turn off all power to the unit.

4. Move the control service switch S1 to the “off” position.

5. Close the suction and discharge shutoff valves on the compressor(s) and the liquid outlet

valves at the condenser(s) or receiver(s).

6. Tag all opened disconnect switches to warn against start-up before opening the compressor

suction and discharge valves.

7. Drain all water from the unit evaporator and chilled water piping if the unit is to be shut down

during the winter and exposed to below freezing temperatures. Do not leave the vessels or

piping open to the atmosphere over the shutdown period.

Start-up after Extended Shutdown

1. Inspect all equipment to see that it is in satisfactory operating condition.

2. Backseat the compressor suction and discharge valves. Always replace valve seal caps.

3. Open the manual liquid line shutoff valves.

4. Check circuit breakers. They must be in the “off” position.

5. Check to see that the pumpdown switches PS1 and PS2 are in the “manual shutdown” position

and the control system switch S1 is in the “off” position.

6. Throw the main power and control circuit disconnects to the “on” position.

7. Allow the crankcase heaters to operate for at least 12 hours prior to start-up.

8. Start the source water flow and purge the water piping as well as the evaporator in the unit.

9. Start the auxiliary equipment for the installation by turning on the time clock, ambient

thermostat and/or remote on/off switch.

10. Adjust the setpoint on the MicroTech controller to the desired hot water temperature.

11. Check resets of all equipment protection controls.

12. Switch the unit circuit breakers to “on.”

13. Start the system by pushing the system switch S1 to “on.”

!

CAUTION

Most relays and terminals in the control center are powered when S1 is closed and the

control circuit disconnect is on. Do not close S1 until ready for start-up or serious

equipment damage can occur.

14. Place pumpdown switch(es) PS1 and PS2 to the “auto pumpdown” position for restart and

normal operation.

15. After running the unit for a short time, check the oil level in each compressor crankcase

and for flashing in the refrigerant sightglass (see Maintenance section).

20 TGZ 040A through TGZ 190A OMM TGZ-1

Sequence of Operation

The following sequence of operation is typical for TGZ Templifier models when in the

heating mode. The sequence can vary slightly depending upon options.

Start-up/Compressor Staging (when compressors start and stop)

Stage Up Temperature (displayed on ‘VIEW UNIT TEMP (3)’ screen) is the Condenser

Leaving Water Temperature by which the next compressor to start will stage up (start) after at

least one compressor on the unit has started and is running.

Start Up Temperature (displayed on ‘VIEW UNIT TEMP (3)’ screen) is the Condenser

Leaving Water Temperature by which the first compressor starts. The start up temperature

equals the Stage Up Temperature minus the Start Delta Temperature set point. A higher Start

Delta Temperature set point value will keep the unit off longer and reduce unit cycling at low

loads. However, this high Start Delta Temperature set point will cause a larger excursion from

the Active Heat Leaving Water Temperature set point before the unit starts. Stated another

way, the Start Delta Temperature set point is the number of degrees below the Active Heat

Leaving Water Temperature set point, minus ½ the Control Band, that determines when the

first compressor starts. The Start Delta is in effect for only the first start after all compressors

have been off. Additional compressor starts and stops are determined by the Condenser

Leaving Water Temperature (LWT) with respect to the Control Band only. The Control Band

is automatically set based upon the number of stages (compressors) for the unit. A four (4)

compressor unit will have a Control Band that is 30% of the CondDeltaT set point. A six (6)

compressor unit will have a Control Band that is 20% of the CondDeltaT set point.

The following sequence would occur for the settings shown below for a four compressor unit:

CondDelta T set point = 10.0°F

StartDelta set point = 5.0°F

StopDelta set point = 2.0°F

Heat LWT set point = 140.0°F

The calculated Control Band will be 30% of 10ºF (Cond Delta T) which is 3ºF.

For a cold start-up (no compressors running), the first compressor will start at any temperature

below 133.5°F. Each subsequent compressor will start after the Stage Up Timer has timed out and if

the temperature is below the Control Band, 138.5°F in this case.

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McQuay TGZ 050 Operation and Maintenance Manual

McQuay TGZ 050 Operation and Maintenance Manual

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